WO2019216745A1

WO2019216745A1 - Method for transmitting and receiving physical downlink shared channel in wireless communication system, and device for supporting same

Info

Publication number: WO2019216745A1
Application number: PCT/KR2019/095007
Authority: WO
Inventors: 이현호; 곽규환; 이승민; 이윤정
Original assignee: 엘지전자 주식회사
Priority date: 2018-05-09
Filing date: 2019-05-09
Publication date: 2019-11-14

Abstract

The present specification presents a method for transmitting and receiving a physical downlink shared channel (PDSCH) in a wireless communication system, and a device for supporting same. Particularly, the method performed by a terminal may comprise the steps of: receiving, from a base station, a higher level signal comprising first information about a configuration of a PDSCH-repetition-related operation; receiving, from the base station, second information related to an uplink-downlink configuration; receiving, from the base station, on the basis of the first information, downlink control information (DCI) comprising information related to the number of PDSCH repetitions; repeatedly receiving the PDSCH from the base station, on the basis of the second information and the DCI; and determining whether to continue repeatedly receiving the PDSCH on the basis of the duration of at least one transmission time unit, if the at least one transmission time unit for uplink transmission exists during repeated reception of the PDSCH.

Description

Method for transmitting and receiving a physical downlink shared channel in a wireless communication system and an apparatus supporting the same

The present disclosure relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a physical downlink shared channel (PDSCH) repetition and a device supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

An object of the present specification is to provide a method for improving PDSCH transmission / reception reliability in a PDSCH repetition operation.

It is also an object of the present specification to provide a method for implementing low latency in PDSCH repetition operation.

In addition, in the present specification, when one or more transmission time units for uplink transmission are present during PDSCH repetition, determining whether to stop PDSCH repetitive transmission or reception in consideration of the duration of one or more transmission time units, thereby transmitting and receiving reliability and latency performance. The purpose is to improve this.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The present specification proposes a method for receiving a physical downlink shared channel (PDSCH) in a wireless communication system. A method performed by a terminal includes receiving an upper layer signal from a base station, the upper layer signal including first information about a configuration of a PDSCH repetition related operation, and a UL-DL configuration associated with an uplink-downlink configuration. Receiving second information from the base station, receiving downlink control information (DCI) from the base station, the downlink control information including the PDSCH repetition number related information based on the first information, and the second information. Repeatedly receiving the PDSCH from the base station based on the information and the DCI; and if one or more transmission time units exist for uplink transmission during repeated reception of the PDSCH, duration of the one or more transmission time units. And determining whether to continue to receive the PDSCH repeatedly based on the determination.

In the method of the present specification, when the duration of the one or more transmission time units is longer than a specific time, the repeated reception of the PDSCH is stopped, and when the duration of the one or more transmission time units is less than a specific time, the The method may further include continuously receiving the PDSCH after one or more transmission time units.

In addition, in the method of the present specification, each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.

In addition, in the method of the present specification, the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).

In addition, the terminal for receiving a physical downlink shared channel (PDSCH) in the wireless communication system of the present specification includes a transceiver for transmitting and receiving a radio signal, and a processor functionally connected to the transceiver The processor may receive a higher layer signal from the base station, the upper layer signal including first information about a configuration of a PDSCH repetition related operation, and receive second information related to a UL-DL configuration. Receive Downlink Control Information (DCI) from the base station and received from the base station, the downlink control information (DCI) including the PDSCH repetition number related information based on the first information, and based on the second information and the DCI Repeatedly receiving the PDSCH from a base station, and one or more for uplink transmission during repeated reception of the PDSCH If the transmission time units are present, it can be controlled so as to determine on the basis of the duration of the one or more transmission time units to continue to receive repeatedly the PDSCH.

Further, in the terminal of the present specification, when the duration of the one or more transmission time units is more than a specific time, the processor stops the repeated reception of the PDSCH, and the duration of the one or more transmission time units is a specific time. If less than one, it may be controlled to continuously receive the PDSCH after the one or more transmission time units.

In addition, in the terminal of the present specification, each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.

Further, in the terminal of the present specification, the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).

In addition, the base station for transmitting a physical downlink shared channel (PDSCH) in the wireless communication system of the present specification includes a transceiver for transmitting and receiving a radio signal, and a processor functionally connected to the transceiver In addition, the processor transmits an upper layer signal including first information about a configuration of a PDSCH repetition related operation to a terminal and transmits second information related to uplink-downlink configuration (UL-DL configuration). Downlink Control Information (DCI) is transmitted to the terminal and includes downlink control information (DCI) including information related to the number of PDSCH repetitions to the terminal, the PDSCH is repeatedly transmitted to the terminal, and the uplink is transmitted during the repeated transmission of the PDSCH. If there are one or more transmission time units for link transmission, the phase is based on the duration of the one or more transmission time units. It can be controlled to determine whether to continue to repeatedly transfer the PDSCH.

Further, in the base station of the present specification, the processor stops repetitive transmission of the PDSCH when the duration of the one or more transmission time units is greater than or equal to a specific time, and the duration of the one or more transmission time units is less than a specific time. In this case, the PDSCH may be continuously transmitted repeatedly after the one or more transmission time units.

In addition, in the base station of the present specification, each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.

In addition, in the base station of the present specification, the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).

According to the present specification, there is an effect of improving PDSCH transmission and reception reliability in PDSCH repetition operation.

In addition, according to the present specification, there is an effect of implementing a low latency (latency) in the PDSCH repetition operation.

In addition, according to the present specification, when there is one or more transmission time units for uplink transmission during PDSCH repetition, by determining whether to stop PDSCH repetitive transmission or reception in consideration of the duration of one or more transmission time units, This has the effect of improving latency performance.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical features of the present invention.

1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.

FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.

Figure 5 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

6 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied.

7 shows an example of a frame structure in an NR system.

FIG. 8 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

9 shows examples of an antenna port and a number-specific resource grid to which the method proposed in this specification can be applied.

10 shows an example of a self-contained structure to which the method proposed in this specification can be applied.

FIG. 11 illustrates an example in which physical uplink control channel (PUCCH) formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.

12 illustrates a structure of a channel quality indicator (CQI) channel in the case of a general cyclic prefix (CP) in a wireless communication system to which the present invention can be applied.

13 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.

14 shows an example of transport channel processing of an uplink shared channel (UL-SCH) in a wireless communication system to which the present invention can be applied.

FIG. 15 shows an example of a signal processing procedure of an uplink shared channel which is a transport channel in a wireless communication system to which the present invention can be applied.

16 shows an example of generating and transmitting five SC-FDMA symbols during one slot in a wireless communication system to which the present invention can be applied.

FIG. 17 shows an ACK / NACK channel structure for PUCCH format 3 having a general cyclic prefix (CP).

FIG. 18 is a diagram for describing a method of assuming PDSCH transmission to which the same precoder is applied when a terminal misses a physical layer signal indicating a transmission direction.

19 is a flowchart illustrating a method of operating a terminal proposed in the present specification.

20 is a flowchart illustrating a method of operating a base station proposed in the present specification.

21 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.

22 is a block diagram illustrating a communication device according to one embodiment of the present invention.

FIG. 23 is a diagram illustrating an example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.

24 is a diagram illustrating still another example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.

25 is a diagram illustrating an example of a signal processing module to which the methods proposed in the specification can be applied.

FIG. 26 is a diagram illustrating another example of a signal processing module to which the methods proposed herein may be applied. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. . In addition, a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA It can be used in various radio access systems such as non-orthogonal multiple access. CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

For clarity, the following description focuses on the 3GPP LTE / LTE-A / NR system, but the technical features of the present invention are not limited thereto.

System general

3GPP LTE / LTE-A supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).

In FIG. 1, the size of the radio frame in the time domain is expressed as a multiple of a time unit of T_s = 1 / (15000 * 2048). Downlink and uplink transmission consists of a radio frame having a period of T_f = 307200 * T_s = 10ms.

1A illustrates the structure of a type 1 radio frame. Type 1 radio frames may be applied to both full duplex and half duplex FDD.

A radio frame consists of 10 subframes. One radio frame is composed of 20 slots having a length of T_slot = 15360 * T_s = 0.5ms, and each slot is assigned an index of 0 to 19. One subframe consists of two consecutive slots in the time domain, and subframe i consists of slot 2i and slot 2i + 1. The time taken to transmit one subframe is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.

In FDD, uplink transmission and downlink transmission are distinguished in the frequency domain. While there is no restriction on full-duplex FDD, the terminal cannot simultaneously transmit and receive in half-duplex FDD operation.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period. A resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

FIG. 1B illustrates a frame structure type 2. FIG.

Type 2 radio frames consist of two half frames each 153600 * T_s = 5 ms in length. Each half frame consists of five subframes of 30720 * T_s = 1ms in length.

In a type 2 frame structure of a TDD system, an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes.

Table 1 shows an uplink-downlink configuration.

Referring to Table 1, for each subframe of a radio frame, 'D' represents a subframe for downlink transmission, 'U' represents a subframe for uplink transmission, and 'S' represents a downlink pilot. A special subframe consisting of three fields: Time Slot, Guard Period (GP), and Uplink Pilot Time Slot (UpPTS). DwPTS indicates initial cell search, synchronization, or channel estimation in a UE. Used for UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

Each subframe i is composed of slots 2i and slots 2i + 1 each having a length of T_slot = 15360 * T_s = 0.5ms.

The uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.

The time point when the downlink is changed from the uplink or the time point when the uplink is switched to the downlink is called a switching point. Switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are repeatedly switched in the same manner, and both 5ms or 10ms are supported. In case of having a period of 5ms downlink-uplink switching time, the special subframe S exists every half-frame, and in case of having a period of 5ms downlink-uplink switching time, it exists only in the first half-frame.

In all configurations,

subframes

0 and 5 and DwPTS are sections for downlink transmission only. The subframe immediately following the UpPTS and the subframe subframe is always an interval for uplink transmission.

The uplink-downlink configuration may be known to both the base station and the terminal as system information. When the uplink-downlink configuration information is changed, the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information. In addition, the configuration information is a kind of downlink control information, which may be transmitted through a physical downlink control channel (PDCCH) like other scheduling information, and is commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information. May be

Table 2 shows the configuration of the special subframe (length of DwPTS / GP / UpPTS).

The structure of a radio frame according to the example of FIG. 1 is just one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may vary. Can be.

2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

Referring to FIG. 2, one downlink slot includes a plurality of OFDM symbols in the time domain. Here, one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.

Each element on the resource grid is a resource element, and one resource block (RB) includes 12 × 7 resource elements. The number N ^ DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.

The structure of the uplink slot may be the same as the structure of the downlink slot.

Referring to FIG. 3, up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated. data region). An example of a downlink control channel used in 3GPP LTE includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.

The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe. The PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ). Control information transmitted through the PDCCH is called downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.

The PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also called a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal It may carry a set of transmission power control commands for the individual terminals in the group, activation of Voice over IP (VoIP), and the like. The plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs. The PDCCH consists of a set of one or a plurality of consecutive CCEs. CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.

The base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH. If the PDCCH for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI) may be masked to the CRC. If the system information, more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC. In order to indicate a random access response that is a response to the transmission of the random access preamble of the UE, a random access-RNTI (RA-RNTI) may be masked to the CRC.

Enhanced PDCCH (EPDCCH) carries UE-specific signaling. The EPDCCH is located in a physical resource block (PRB) that is UE-specifically configured. In other words, as described above, the PDCCH may be transmitted in up to three OFDM symbols in the first slot in the subframe, but the EPDCCH may be transmitted in a resource region other than the PDCCH. The start time (ie, symbol) of the EPDCCH in the subframe may be configured in the terminal through higher layer signaling (eg, RRC signaling, etc.).

EPDCCH is a transport format associated with the DL-SCH, resource allocation and HARQ information, a transport format associated with the UL-SCH, resource allocation and HARQ information, resource allocation associated with Side-link Shared Channel (SL-SCH) and Physical Sidelink Control Channel (PSCCH) Can carry information, etc. Multiple EPDCCHs may be supported and the UE may monitor a set of EPCCHs.

The EPDCCH may be transmitted using one or more consecutive enhanced CCEs (ECCEs), and the number of ECCEs per single EPDCCH may be determined for each EPDCCH format.

Each ECCE may be composed of a plurality of enhanced resource element groups (EREGs). EREG is used to define the mapping of ECCE to RE. There are 16 EREGs per PRB pair. Except for REs carrying DMRS within each pair of PRBs, all REs are numbered 0 through 15 in order of increasing frequency followed by time increments.

The terminal may monitor the plurality of EPDCCHs. For example, one or two EPDCCH sets in one PRB pair in which the UE monitors EPDCCH transmission may be configured.

By combining different numbers of ECCEs, different coding rates for the EPCCH may be realized. The EPCCH may use localized transmission or distributed transmission, so that the mapping of ECCE to the RE in the PRB may be different.

Referring to FIG. 4, an uplink subframe may be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region. The data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data. In order to maintain a single carrier characteristic, one UE does not simultaneously transmit a PUCCH and a PUSCH.

A PUCCH for one UE is allocated a resource block (RB) pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).

In addition, the invention proposed herein may be applied not only to LTE / LTE-A system (or device) but also to 5G NR system (or device).

Hereinafter, communication of a 5G NR system will be described with reference to FIGS. 5 to 10.

5G NR systems define Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (MMTC), Ultra-Reliable and Low Latency Communications (URLLC), and vehicle-to-everything (V2X) based on usage scenarios (such as service type). do.

The 5G NR standard is divided into standalone (SA) and non-standalone (NSA) according to co-existence between the NR system and the LTE system.

The 5G NR system supports various subcarrier spacings, and supports CP-OFDM in downlink, CP-OFDM and DFT-s-OFDM in uplink.

As the spread of smart phones and IoT (Internet of Things) terminals is rapidly spreading, the amount of information exchanged through a communication network is increasing. As a result, next-generation wireless access technologies can provide faster service to more users than traditional communication systems (or traditional radio access technologies) (e.g., enhanced mobile broadband communication). )) Needs to be considered.

To this end, a design of a communication system considering a machine type communication (MTC) that provides a service by connecting a plurality of devices and objects has been discussed. In addition, a design of a communication system (eg, Ultra-Reliable and Low Latency Communication (URLLC)) that considers a service and / or terminal sensitive to communication reliability and / or latency is also considered. Is being discussed.

In the following specification, for convenience of description, the next generation radio access technology is referred to as NR (New RAT), and the radio communication system to which the NR is applied is referred to as an NR system.

Definition of terms related to NR systems

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports connectivity to EPC and NGC.

gNB: Node that supports NR as well as connection with NGC.

New RAN: A radio access network that supports NR or E-UTRA or interacts with NGC.

Network slice: A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.

Network function: A network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.

NG-C: Control plane interface used for the NG2 reference point between the new RAN and NGC.

NG-U: User plane interface used for the NG3 reference point between the new RAN and NGC.

Non-standalone NR: A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.

Non-Standalone E-UTRA: Deployment configuration in which the eLTE eNB requires gNB as an anchor for control plane connection to NGC.

User plane gateway: The endpoint of the NG-U interface.

Referring to FIG. 5, the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and user equipment (UE). do.

The gNBs are interconnected via an X _n interface.

The gNB is also connected to the NGC via an NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.

NR (New Rat) Numerology and Frame Structure

Multiple numerologies can be supported in an NR system. Here, the numerology may be defined by subcarrier spacing and cyclic prefix overhead. At this time, multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing to an integer N (or μ). Further, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the used numerology may be selected independently of the frequency band.

In addition, in the NR system, various frame structures according to a number of numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) neurology and frame structure that can be considered in an NR system will be described.

Multiple OFDM numerologies supported in the NR system may be defined as shown in Table 3.

With regard to the frame structure in the NR system, the size of the various fields in the time domain

Is expressed as a multiple of the time unit. From here,

ego,

to be. Downlink and uplink transmissions

It consists of a radio frame having a section of (radio frame). Here, each radio frame is

It consists of 10 subframes having a section of. In this case, there may be a set of frames for uplink and a set of frames for downlink. FIG. 6 shows an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied. Indicates a relationship between

As shown in FIG. 6, the transmission of an uplink frame number i from a user equipment (UE) is greater than the start of the corresponding downlink frame at the corresponding UE.

You must start before.

Numerology

For slots, slots within a subframe

Numbered in increasing order of within a radio frame

They are numbered in increasing order of. One slot

Consists of consecutive OFDM symbols of,

Is determined according to the numerology and slot configuration used. Slot in subframe

Start of OFDM symbol in the same subframe

Is aligned with the beginning of time.

Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot can be used.

Table 4 shows the number of OFDM symbols per slot in a normal CP.

), The number of slots per radio frame (

), The number of slots per subframe (

Table 5 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

7 shows an example of a frame structure in an NR system. 7 is merely for convenience of explanation and does not limit the scope of the present invention. In Table 5, as an example of the case of 占 = 2, i.e., a subcarrier spacing (SCS) of 60 kHz. , Referring to Table 4, one subframe (or frame) may include four slots, and one subframe = {1,2,4} slots shown in FIG. 3 may be included in one subframe as an example. The number of slot (s) present can be defined as shown in Table 2.

In addition, the mini-slot may consist of two, four or seven symbols, and may consist of more or fewer symbols.

In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.

Hereinafter, the physical resources that may be considered in the NR system will be described in detail.

First, with respect to the antenna port, the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of the channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship. Here, the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

Referring to FIG. 8, the resource grid is in the frequency domain

By way of example, one subframe includes 14 x 2 ^ u OFDM symbols, but is not limited thereto.

In an NR system, the transmitted signal is

One or more resource grids composed of subcarriers, and

Is described by the OFDM symbols of. From here,

to be. remind

Denotes the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.

In this case, as shown in Fig. 9, the numerology

And one resource grid for each antenna port p.

Numerology

And each element of the resource grid for antenna port p is referred to as a resource element and is an index pair

Uniquely identified by From here,

Is the index on the frequency domain,

Refers to the position of a symbol within a subframe. Index pair when referring to a resource element in a slot

This is used. From here,

to be.

Numerology

Resource elements for antenna and antenna port p

Is a complex value

Corresponds to If there is no risk of confusion, or if no specific antenna port or numerology is specified, the indices p and

Can be dropped, so the complex value is

or

This can be

In addition, a physical resource block may be located in the frequency domain.

It is defined as consecutive subcarriers.

Point A serves as a common reference point of the resource block grid and can be obtained as follows.

OffsetToPointA for the PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block and point A overlapping with the SS / PBCH block used by the UE for initial cell selection, and a 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;

absoluteFrequencyPointA indicates the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN).

Common resource blocks set subcarrier spacing

It is numbered from zero up in the frequency domain for.

Set subcarrier spacing

The center of the subcarrier 0 of the common resource block 0 with respect to 'point A'. Common resource block number in the frequency domain

And subcarrier spacing

The resource element (k, l) for may be given by Equation 1 below.

From here,

Is

It can be defined relative to point A to correspond to the subcarrier centered on this point A. Physical resource blocks are zero-based within the bandwidth part (BWP).

Numbered until,

Is the number of the BWP. Physical resource blocks on BWP i

And common resource blocks

Can be given by Equation 2 below.

From here,

May be a common resource block in which the BWP starts relative to common resource block 0.

Self-contained structure

The time division duplex (TDD) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one slot (or subframe). This is to minimize latency of data transmission in a TDD system, and the structure may be referred to as a self-contained structure or a self-contained slot.

10 shows an example of a self-contained structure to which the method proposed in this specification can be applied. 10 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 10, as in the case of legacy LTE, it is assumed that one transmission unit (eg, slot, subframe) is composed of 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols.

In FIG. 10, region 1002 denotes a downlink control region, and region 1004 denotes an uplink control region. In addition, regions other than the region 1002 and the region 1004 (that is, regions without a separate indication) may be used for transmitting downlink data or uplink data.

That is, uplink control information and downlink control information may be transmitted in one self-contained slot. On the other hand, in the case of data, uplink data or downlink data may be transmitted in one self-contained slot.

In the case of using the structure shown in FIG. 10, within one self-contained slot, downlink transmission and uplink transmission may proceed sequentially, and transmission of downlink data and reception of uplink ACK / NACK may be performed.

As a result, when an error in data transmission occurs, the time required for retransmission of data can be reduced. In this way, delays associated with data delivery can be minimized.

In the self-contained slot structure as shown in FIG. 10, a process of switching from a transmission mode to a reception mode by a base station (eNodeB, eNB, gNB) and / or a terminal (User Equipment) Alternatively, a time gap for switching from a reception mode to a transmission mode is required. In relation to the time gap, when uplink transmission is performed after downlink transmission in the self-contained slot, some OFDM symbol (s) may be set to a guard period (GP).

Physical Uplink Control Channel (PUCCH)

The uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.

HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful. In a conventional wireless communication system, one bit is transmitted as ACK / NACK information for downlink single codeword transmission, and two bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.

Channel measurement information refers to feedback information related to a multiple input multiple output (MIMO) technique, and includes channel quality indicator (CQI), precoding matrix index (PMI), and rank indicator (RI). : Rank Indicator) may be included. These channel measurement information may be collectively expressed as CQI.

20 bits per subframe may be used for transmission of the CQI.

PUCCH may be modulated using Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK). Control information of a plurality of terminals may be transmitted through a PUCCH, and a constant amplitude zero autocorrelation (CAZAC) sequence having a length of 12 is performed when code division multiplexing (CDM) is performed to distinguish signals of respective terminals. Mainly used. Since the CAZAC sequence has a characteristic of maintaining a constant amplitude in the time domain and the frequency domain, the coverage is reduced by reducing the Peak-to-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the UE. It has a suitable property to increase. In addition, ACK / NACK information for downlink data transmission transmitted through the PUCCH is covered using an orthogonal sequence or an orthogonal cover (OC).

In addition, the control information transmitted on the PUCCH may be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values. The cyclically shifted sequence may be generated by cyclically shifting a base sequence by a specific cyclic shift amount. The specific CS amount is indicated by the cyclic shift index (CS index). The number of cyclic shifts available may vary depending on the delay spread of the channel. Various kinds of sequences may be used as the base sequence, and the above-described CAZAC sequence is one example.

In addition, the amount of control information that can be transmitted in one subframe by the UE depends on the number of SC-FDMA symbols available for transmission of the control information (that is, RS transmission for coherent detection of PUCCH). SC-FDMA symbols except for the SC-FDMA symbol used).

In the 3GPP LTE system, PUCCH is defined in seven different formats according to transmitted control information, modulation scheme, amount of control information, and the like, and according to uplink control information (UCI) transmitted according to each PUCCH format, The attributes can be summarized as shown in Table 6 below.

PUCCH format 1 is used for single transmission of SR. In case of SR-only transmission, an unmodulated waveform is applied, which will be described later in detail.

PUCCH format

1a or 1b is used for transmission of HARQ ACK / NACK. When HARQ ACK / NACK is transmitted alone in any subframe,

PUCCH format

1a or 1b may be used. Alternatively, HARQ ACK / NACK and SR may be transmitted in the same subframe using

PUCCH format

1a or 1b.

PUCCH format 2 is used for transmission of CQI, and

PUCCH format

2a or 2b is used for transmission of CQI and HARQ ACK / NACK.

In the case of an extended CP, PUCCH format 2 may be used for transmission of CQI and HARQ ACK / NACK.

FIG. 11 shows an example of a form in which PUCCH formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.

In FIG. 11, N_RB ^ UL denotes the number of resource blocks in uplink, and 0, 1, ..., N_RB ^ UL-1 denotes the number of physical resource blocks. Basically, the PUCCH is mapped to both edges of the uplink frequency block. As shown in FIG. 11, PUCCH format 2 / 2a / 2b is mapped to a PUCCH region indicated by m = 0,1, which means that resource blocks in which PUCCH format 2 / 2a / 2b is located at a band-edge It can be expressed as mapped to. In addition, PUCCH format 2 / 2a / 2b and PUCCH format 1 / 1a / 1b may be mapped to a PUCCH region indicated by m = 2. Next, the PUCCH format 1 / 1a / 1b may be mapped to the PUCCH region represented by m = 3,4,5. The number of PUCCH RBs (N_RB ^ (2)) usable by the PUCCH format 2 / 2a / 2b may be indicated to terminals in a cell by broadcasting signaling.

The PUCCH format 2 / 2a / 2b will be described. PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQI, PMI, RI).

The reporting period of the channel measurement feedback (hereinafter, collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured may be controlled by the base station. Periodic and aperiodic CQI reporting can be supported in the time domain. PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting. In the case of aperiodic reporting, the base station may instruct the terminal to transmit an individual CQI report on a resource scheduled for uplink data transmission.

12 shows a structure of a CQI channel in the case of a general CP in a wireless communication system to which the present invention can be applied.

Of SC-FDMA symbols 0 to 6 of one slot, SC-FDMA symbols 1 and 5 (second and sixth symbols) are used for demodulation reference signal (DMRS) transmission, and CQI in the remaining SC-FDMA symbols. Information can be transmitted. Meanwhile, in the case of an extended CP, one SC-FDMA symbol (SC-FDMA symbol 3) is used for DMRS transmission.

In the PUCCH format 2 / 2a / 2b, modulation by a CAZAC sequence is supported, and a QPSK modulated symbol is multiplied by a length 12 CAZAC sequence. The cyclic shift (CS) of the sequence is changed between symbol and slot. Orthogonal covering is used for DMRS.

Reference signal (DMRS) is carried on two SC-FDMA symbols spaced by three SC-FDMA symbol intervals among seven SC-FDMA symbols included in one slot, and CQI information is carried on the remaining five SC-FDMA symbols. Two RSs are used in one slot to support a high speed terminal. In addition, each terminal is distinguished using a cyclic shift (CS) sequence. The CQI information symbols are modulated and transmitted throughout the SC-FDMA symbol, and the SC-FDMA symbol is composed of one sequence. That is, the terminal modulates and transmits the CQI in each sequence.

The number of symbols that can be transmitted in one TTI is 10, and modulation of CQI information is determined up to QPSK. When QPSK mapping is used for an SC-FDMA symbol, a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe. A frequency domain spread code is used to spread the CQI information in the frequency domain.

As the frequency domain spreading code, a length-12 CAZAC sequence (eg, a ZC sequence) may be used. Each control channel may be distinguished by applying a CAZAC sequence having a different cyclic shift value. IFFT is performed on the frequency domain spread CQI information.

12 different terminals may be orthogonally multiplexed on the same PUCCH RB by means of 12 equally spaced cyclic shifts. The DMRS sequence on SC-FDMA symbol 1 and 5 (on SC-FDMA symbol 3 in extended CP case) in the general CP case is similar to the CQI signal sequence on the frequency domain but no modulation such as CQI information is applied.

UE is a PUCCH resource index (

,

May be semi-statically configured by higher layer signaling to periodically report different CQI, PMI, and RI types on the PUCCH resource indicated by h). Where the PUCCH resource index (

) Is information indicating a PUCCH region used for PUCCH format 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.

PUCCH Channel Structure

The PUCCH formats 1a and 1b will be described.

In the PUCCH format 1a / 1b, a symbol modulated using a BPSK or QPSK modulation scheme is multiply multiplied by a CAZAC sequence having a length of 12. For example, the result of multiplying modulation symbol d (0) by length CAZAC sequence r (n) (n = 0, 1, 2, ..., N-1) is y (0), y (1). ), y (2), ..., y (N-1). The y (0), ..., y (N-1) symbols may be referred to as a block of symbols. After multiplying the CAZAC sequence by the modulation symbol, block-wise spreading using an orthogonal sequence is applied.

A Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal.

A Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP.

13 exemplarily shows a PUCCH channel structure for HARQ ACK / NACK transmission without CQI.

A reference signal RS is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbols included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.

Meanwhile, in the case of an extended CP, RS may be carried on two consecutive symbols in the middle. The number and position of symbols used for the RS may vary depending on the control channel, and the number and position of symbols used for the ACK / NACK signal associated therewith may also be changed accordingly.

1 bit and 2 bit acknowledgment information (unscrambled state) may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPSK modulation techniques, respectively. The acknowledgment (ACK) may be encoded as '1', and the negative acknowledgment (NACK) may be encoded as '0'.

When transmitting control signals in the allocated band, two-dimensional spreading is applied to increase the multiplexing capacity. That is, frequency domain spreading and time domain spreading are simultaneously applied to increase the number of terminals or control channels that can be multiplexed.

In order to spread the ACK / NACK signal in the frequency domain, a frequency domain sequence is used as the base sequence. As the frequency domain sequence, one of the CAZAC sequences may be a Zadoff-Chu (ZC) sequence. For example, different cyclic shifts (CS) are applied to a ZC sequence, which is a basic sequence, so that multiplexing of different terminals or different control channels may be applied. The number of CS resources supported in an SC-FDMA symbol for PUCCH RBs for HARQ ACK / NACK transmission is set by the cell-specific higher-layer signaling parameter (k).

The frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code. As the orthogonal spreading code, a Walsh-Hadamard sequence or a DFT sequence may be used. For example, the ACK / NACK signal may be spread using orthogonal sequences w0, w1, w2, and w3 of length 4 for four symbols. RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (OC).

A plurality of terminals may be multiplexed using a code division multiplexing (CDM) scheme using the CS resource in the frequency domain and the OC resource in the time domain as described above. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.

For this time domain spreading CDM, the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the multiplexing capacity of the RS is smaller than that of the ACK / NACK information.

For example, in case of a normal CP, ACK / NACK information may be transmitted in four symbols. For the ACK / NACK information, three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.

In the case where three symbols in one slot are used for RS transmission and four symbols are used for ACK / NACK information transmission in a subframe of a general CP, for example, six cyclic shifts (CS) and If three orthogonal cover (OC) resources are available in the time domain, HARQ acknowledgments from a total of 18 different terminals can be multiplexed within one PUCCH RB. If two symbols in one slot are used for RS transmission and four symbols are used for ACK / NACK information transmission in a subframe of an extended CP, for example, six cyclic shifts in the frequency domain ( If two orthogonal cover (OC) resources can be used in the CS) and the time domain, HARQ acknowledgments from a total of 12 different terminals can be multiplexed within one PUCCH RB.

Next, PUCCH format 1 will be described. The scheduling request SR is transmitted in such a manner that the terminal requests or does not request to be scheduled. The SR channel reuses the ACK / NACK channel structure in PUCCH formats 1a / 1b and is configured in an OOK (On-Off Keying) scheme based on the ACK / NACK channel design. Reference signals are not transmitted in the SR channel. Therefore, a sequence of length 7 is used for a general CP, and a sequence of length 6 is used for an extended CP. Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK. That is, for positive SR transmission, the UE transmits HARQ ACK / NACK through resources allocated for SR. In order to transmit a negative SR, the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.

Next, the enhanced-PUCCH (e-PUCCH) format will be described. The e-PUCCH may correspond to PUCCH format 3 of the LTE-A system. Block spreading can be applied to ACK / NACK transmission using PUCCH format 3.

PUCCH piggybacking in Rel-8 LTE

14 shows an example of transport channel processing of a UL-SCH in a wireless communication system to which the present invention can be applied.

In the 3GPP LTE system (= E-UTRA, Rel. 8), in the case of UL, the peak-to-average power ratio (PAPR) characteristic or CM (PAPR) affecting the performance of the power amplifier for efficient use of the power amplifier of the terminal. Cubic Metric is designed to maintain good single carrier transmission. That is, in the case of PUSCH transmission in the existing LTE system, the single carrier characteristics are maintained through DFT-precoding for data to be transmitted, and in the case of PUCCH transmission, information is transmitted on a sequence having a single carrier characteristic to transmit single carrier characteristics. I can keep it. However, when the DFT-precoding data is discontinuously allocated on the frequency axis or when PUSCH and PUCCH are simultaneously transmitted, this single carrier characteristic is broken. Accordingly, as shown in FIG. 8, when there is a PUSCH transmission in the same subframe as the PUCCH transmission, uplink control information (UCI) information to be transmitted to the PUCCH is transmitted together with data through the PUSCH in order to maintain a single carrier characteristic.

As described above, since a conventional LTE terminal cannot simultaneously transmit a PUCCH and a PUSCH, a method of multiplexing uplink control information (UCI) (CQI / PMI, HARQ-ACK, RI, etc.) in a PUSCH region in a subframe in which a PUSCH is transmitted use.

For example, in case of transmitting Channel Quality Indicator (CQI) and / or Precoding Matrix Indicator (PMI) in a subframe allocated to transmit PUSCH, UL-SCH data and CQI / PMI are multiplexed before DFT-spreading and control information. You can send data together. In this case, UL-SCH data performs rate-matching in consideration of CQI / PMI resources. In addition, control information such as HARQ ACK, RI, and the like is multiplexed in the PUSCH region by puncturing UL-SCH data.

Hereinafter, a signal processing procedure of an uplink shared channel (hereinafter, referred to as "UL-SCH") may be applied to one or more transport channels or control information types.

Referring to FIG. 15, the UL-SCH transmits data to a coding unit in the form of a transport block (TB) once every transmission time interval (TTI).

CRC parity bits P_0 to P_L-1 are attached to bits a_0 to a_A-1 of the transport block received from the upper layer. In this case, A is the size of the transport block, L is the number of parity bits. Input bits with a CRC are the same as b_0 ~ b_B-1. In this case, B represents the number of bits of the transport block including the CRC.

b_0 to b_B-1 are segmented into a plurality of code blocks (CBs) according to the TB size, and a CRC is attached to the divided CBs. After code block division and CRC attachment, bits are equal to c_r0 to c_r (Kr-1). Where r is the number of code blocks (r = 0, 쪋, C-1), and Kr is the number of bits according to code block r. In addition, C represents the total number of code blocks.

Subsequently, channel coding is performed. The output bits after channel coding are the same as d_r0 ^ (i) to d_r (Dr-1) ^ (i). In this case, i is an encoded stream index and may have a value of 0, 1, or 2. Dr represents the number of bits of the i th coded stream for the code block r. r is a code block number (r = 0, 쪋, C-1), and C represents the total number of code blocks. Each code block may be encoded by turbo coding, respectively.

Then, Rate Matching is performed. The bits after the rate matching are the same as e_r0 to e_r (Er-1). In this case, r is the number of code blocks (r = 0, 쪋, C-1), and C represents the total number of code blocks. Er represents the number of rate matched bits of the r th code block.

Then, concatenation between code blocks is performed again. The bits after combining the code blocks are equal to f_0 to f_G-1. In this case, G represents the total number of encoded bits for transmission, and when the control information is multiplexed with the UL-SCH transmission, the number of bits used for transmission of the control information is not included.

On the other hand, when control information is transmitted in the PUSCH, channel coding is independently performed on the control information CQI / PMI, RI, and ACK / NACK. Since different coded symbols are allocated for transmission of each control information, each control information has a different coding rate.

In the time division duplex (TDD), two modes of ACK / NACK feedback mode and ACK / NACK bundling and ACK / NACK multiplexing are supported by higher layer configuration. For ACK / NACK bundling, the ACK / NACK information bit is composed of 1 bit or 2 bits, and for ACK / NACK multiplexing, the ACK / NACK information bit is composed of 1 to 4 bits.

After the code-block combining step, multiplexing of the coded bits f_0 to f_G-1 of the UL-SCH data and the coded bits q_0 to q_ (N_L * Q_CQI-1) of the CQI / PMI is performed. The multiplexed result of data and CQI / PMI is equal to g_0 ~ g_H'-1. In this case, g_i (i = 0 to H'-1) represents a column vector having a length of (Q_m * N_L). H = (G + N_L * Q_CQI) and H '= H / (N_L * Q_m). N_L represents the number of layers to which UL-SCH transport blocks are mapped, and H represents the total number of encoded bits allocated for UL-SCH data and CQI / PMI information to N_L transport layers to which transport blocks are mapped.

Subsequently, the multiplexed data, CQI / PMI, separately channel-coded RI, and ACK / NACK are channel interleaved to generate an output signal.

PDCCH assignment procedure

A plurality of PDCCHs may be transmitted in one subframe. That is, the control region of one subframe includes a plurality of CCEs having indices 0 to N_ (CCE, k) -1. Here, N_ (CCE, k) -1 means the total number of CCEs in the control region of the kth subframe. The UE monitors the plurality of PDCCHs in every subframe. Here, monitoring means that the UE attempts to decode each of the PDCCHs according to the monitored PDCCH format. In the control region allocated in the subframe, the base station does not provide information on where the PDCCH corresponding to the UE is. In order to receive the control channel transmitted from the base station, the UE cannot know where the PDCCH is transmitted in which CCE aggregation level or DCI format. Therefore, the UE monitors the aggregation of PDCCH candidates in a subframe. Find the PDCCH. This is called blind decoding (BD). Blind decoding refers to a method in which a UE de-masks its UE ID in a CRC portion and then checks the CRC error to determine whether the corresponding PDCCH is its control channel.

In the active mode, the UE monitors the PDCCH of every subframe in order to receive data transmitted to the UE. In the DRX mode, the UE wakes up in the monitoring interval of every DRX cycle and monitors the PDCCH in a subframe corresponding to the monitoring interval. A subframe in which PDCCH monitoring is performed is called a non-DRX subframe.

In order to receive the PDCCH transmitted to the UE, the UE must perform blind decoding on all CCEs present in the control region of the non-DRX subframe. Since the UE does not know which PDCCH format is to be transmitted, it is necessary to decode all PDCCHs at the possible CCE aggregation level until blind decoding of the PDCCH is successful in every non-DRX subframe. Since the UE does not know how many CCEs the PDCCH uses for itself, the UE should attempt detection at all possible CCE aggregation levels until the blind decoding of the PDCCH succeeds. That is, the UE performs blind decoding for each CCE aggregation level. That is, the terminal attempts to decode the CCE aggregation level unit as 1 first. If all of the decoding fails, the decoding is attempted with a CCE aggregation level unit of 2. After that, the CCE aggregation level unit 4 is decoded and the CCE aggregation level unit 8 is decoded. In addition, the UE attempts blind decoding for all four C-RNTI, P-RNTI, SI-RNTI, and RA-RNTI. In addition, the UE attempts blind decoding for all DCI formats to be monitored.

As such, if the UE attempts blind decoding for every CCE aggregation level for all possible RNTIs and for all DCI formats that need to be monitored, the number of detection attempts becomes excessive, so the LTE system searches for blind decoding of the UE. Define the concept of search space (SS). The search space means a PDCCH candidate set for monitoring and may have a different size according to each PDCCH format.

The search space may include a common search space (CSS) and a UE-specific / dedicated search space (USS). In the case of the common search space, all terminals can know the size of the common search space, but the terminal specific search space can be set individually for each terminal. Accordingly, the UE needs to monitor both the UE-specific search space and the common search space in order to decode the PDCCH, thus performing a maximum of 44 blind decoding (BDs) in one subframe. This does not include blind decoding performed according to different CRC values (eg, C-RNTI, P-RNTI, SI-RNTI, RA-RNTI).

Due to the small search space, the base station may be unable to secure the CCE resources for transmitting the PDCCH to all of the terminals to transmit the PDCCH in a given subframe. This is because resources remaining after the CCE location is allocated may not be included in the search space of a specific UE. A terminal specific hopping sequence may be applied to the starting point of the terminal specific search space to minimize this barrier that may continue to the next subframe.

Table 7 shows the sizes of the common search space and the terminal specific search space.

In order to reduce the computational load of the UE according to the number of blind decoding attempts, the UE does not simultaneously perform searches according to all defined DCI formats. In detail, the UE may always search for DCI formats 0 and 1A in the UE-specific search space. In this case, the DCI formats 0 and 1A have the same size, but the UE may distinguish the DCI formats by using a flag used for distinguishing the DCI formats 0 and 1A included in the PDCCH. In addition, according to the PDSCH transmission mode set by the base station, a DCI format other than 0 and 1A may be required for the UE. Examples of DCI formats include 1, 1B, and 2.

In the common search space, the UE may search for DCI formats 1A and 1C. In addition, the UE may be configured to search for DCI format 3 or 3A, and DCI formats 3 and 3A have the same size as DCI formats 0 and 1A, but the UE is a CRC scrambled by an identifier other than the UE specific identifier. DCI format can be distinguished using.

Search space S_k ^ (L) is the aggregation level

PDCCH candidate set according to the. The CCE according to the PDCCH candidate set m of the search space may be determined by Equation 3 below.

Here, M_ (L) represents the number of PDCCH candidates according to the CCE aggregation level L for monitoring in the search space, and m = 0 to M ^ (L) -1. i is an index for designating an individual CCE in each PDCCH candidate, i = 0 to L-1.

As described above, the UE monitors both the UE-specific search space and the common search space to decode the PDCCH. Here, the common search space (CSS) supports PDCCHs having an aggregation level of {4, 8}, and the UE specific search space (USS) supports PDCCHs having an aggregation level of {1, 2, 4, 8}. .

Table 8 shows PDCCH candidates monitored by the UE.

Referring to Equation 3, Y_k is set to 0 for two aggregation levels, L = 4 and L = 8 for the common search space. On the other hand, for the UE-specific search space for the aggregation level L, Y_k is defined as in Equation 4.

here,

The RNTI value used for n_RNTI may be defined as one of an identifier of the terminal. Moreover, A = 39827, D = 65537,

Same as Here, n_s represents a slot number (or index) in a radio frame.

Common ACK / NACK Multiplexing Methods

In a situation where the UE needs to simultaneously transmit a plurality of ACK / NACKs corresponding to a plurality of data units received from the eNB, in order to maintain a single-frequency characteristic of the ACK / NACK signal and reduce the ACK / NACK transmission power, the PUCCH An ACK / NACK multiplexing method based on resource selection may be considered.

With ACK / NACK multiplexing, the contents of ACK / NACK responses for multiple data units are identified by the combination of the PUCCH resource and the resource of QPSK modulation symbols used for the actual ACK / NACK transmission.

For example, if one PUCCH resource transmits 4 bits and 4 data units can be transmitted at maximum, the ACK / NACK result may be identified at the eNB as shown in Table 9 below.

In Table 9, HARQ-ACK (i) represents the ACK / NACK results for the i-th data unit (data unit). In Table 9, DTX (Discontinuous Transmission) means that there is no data unit to be transmitted for the corresponding HARQ-ACK (i) or the terminal does not detect a data unit corresponding to HARQ-ACK (i). According to Table 9, there are up to four PUCCH resources, and b (0) and b (1) are two bits transmitted using the selected PUCCH.

For example, if the terminal successfully receives all four data units, the terminal transmits two bits (1, 1) using n_ (PUCCH, 1) ^ (1).

If the UE fails to decode in the first and third data units and decodes in the second and fourth data units, the UE transmits bit (1, 0) using n_ (PUCCH, 1) ^ (3).

In ACK / NACK channel selection, if there is at least one ACK, the NACK and the DTX are coupled. This is because a combination of reserved PUCCH resources and QPSK symbols cannot indicate all ACK / NACK states. However, in the absence of an ACK, the DTX decouples from the NACK.

In this case, the PUCCH resource linked to the data unit corresponding to one explicit NACK may also be reserved for transmitting signals of multiple ACK / NACKs.

General ACK / NACK Transmission

The LTE-A system considers transmitting a plurality of ACK / NACK information / signals for a plurality of PDSCHs transmitted through a plurality of DL CCs through a specific component carrier (UL CC). To this end, unlike ACK / NACK transmission using PUCCH format 1a / 1b in Rel-8 LTE, after channel coding (eg, Reed-Muller code, Tail-biting convolutional code, etc.) a plurality of ACK / NACK information It may be considered to transmit a plurality of ACK / NACK information / signals using a PUCCH format 2 or a new PUCCH format (ie, an E-PUCCH format) based on block-spreading.

Unlike the conventional PUCCH format 1 series or 2 series, the block spreading scheme modulates control signal transmission using the SC-FDMA scheme. As shown in FIG. 8, a symbol sequence may be spread and transmitted on a time domain using an orthogonal cover code (OCC). By using the OCC, control signals of a plurality of terminals may be multiplexed on the same RB. In the case of the above-described PUCCH format 2, one symbol sequence is transmitted over a time domain and control signals of a plurality of terminals are multiplexed using a cyclic shift (CS) of a CAZAC sequence, whereas a block spread based PUCCH format (for example, In the case of PUCCH format 3), one symbol sequence is transmitted over a frequency domain, and control signals of a plurality of terminals are multiplexed using time-domain spreading using OCC.

FIG. 16 shows an example of generating and transmitting five SC-FDMA symbols (ie, data portions) by using an OCC having a length = 5 (or SF = 5) in one symbol sequence during one slot. In this case, two RS symbols may be used for one slot.

In the example of FIG. 16, an RS symbol may be generated from a CAZAC sequence to which a specific cyclic shift value is applied, and may be transmitted in a form in which a predetermined OCC is applied (or multiplied) over a plurality of RS symbols. In addition, in the example of FIG. 8, it is assumed that 12 modulation symbols are used for each OFDM symbol (or SC-FDMA symbol), and each modulation symbol is generated by QPSK. Becomes 12x2 = 24 bits. Therefore, the number of bits that can be transmitted in two slots is a total of 48 bits. As described above, when the block spread type PUCCH channel structure is used, control information having an extended size can be transmitted as compared to the PUCCH format 1 series and 2 series.

For convenience of description, such a channel coding-based ACK / NACK transmission method using PUCCH format 2 or E-PUCCH format is called a multi-bit ACK / NACK coding transmission method. This method shows a method of transmitting an ACK / NACK coded block generated by channel coding ACK / NACK or discontinuous transmission (DTX) information (which means that a PDCCH cannot be received / detected) for PDSCHs of a plurality of DL CCs. For example, if a UE operates in a SU-MIMO mode in a certain DL CC and receives two codewords (CW), ACK / ACK, ACK / NACK, NACK / ACK, and NACK / NACK for each CC for each CC. A total of four feedback states may be transmitted or may have up to five feedback states including up to DTX. In addition, if the UE receives a single CW, it may have up to three states of ACK, NACK, and DTX (if the NACK is processed in the same way as DTX, two states of ACK, NACK / DTX) May have). Therefore, if the UE aggregates up to 5 DL CCs and operates in the SU-MIMO mode in all CCs, the UE may have up to 55 transmittable feedback states, and the ACK / NACK payload size for expressing them may be The total number of bits is 12 bits (if the DTX is processed in the same way as NACK, the number of feedback states is 45, and the size of the ACK / NACK payload to express the total is 10 bits).

In the foregoing ACK / NACK multiplexing (ie, ACK / NACK selection) method applied to the existing Rel-8 TDD system, it basically corresponds to a PDCCH scheduling each PDSCH of a corresponding UE to secure PUCCH resources of each UE. We consider an implicit ACK / NACK selection method that uses implicit PUCCH resources (ie, linked with the lowest CCE index). Meanwhile, the LTE-A FDD system considers a plurality of ACK / NACK transmissions for a plurality of PDSCHs transmitted through a plurality of DL CCs through one specific UL CC that is basically UE-specific. Implicit PUCCH resources or corresponding implicits that are linked to the PDCCH scheduling certain or some or all DL CCs (ie, linked to the lowest CCE index n_CCE, or linked to n_CCE and n_CCE + 1). Considering an ACK / NACK selection method using a combination of explicit PUCCH resources previously reserved for each UE through PUCCH resources and RRC signaling.

Meanwhile, even in the LTE-A TDD system, a situation in which a plurality of CCs are aggregated (that is, CA) may be considered. Accordingly, a plurality of DL subframes and a plurality of PDSCHs transmitted through the plurality of CCs may be considered. It is considered to transmit a plurality of ACK / NACK information / signal for a specific CC (that is, A / N CC) in an UL subframe corresponding to the plurality of DL subframes. Here, unlike in the LTE-A FDD, a method of transmitting a plurality of ACK / NACKs corresponding to the maximum number of CWs that can be transmitted through all CCs allocated to the UE for all of the plurality of DL subframes (that is, SF) (that is, To reduce the total number of transmitted ACK / NACK by considering full ACK / NACK or by applying ACK / NACK bundling to CW and / or CC and / or SF domains (I.e., bundled ACK / NACK) may be considered (in the case of CW bundling, this means applying ACK / NACK bundling for CW for each DL SF for each DL SF, and for each DL for CC bundling). This means that ACK / NACK bundling for all or some CCs is applied to SF, and SF bundling means applying ACK / NACK bundling for all or some DL SFs to each CC. Method, all PDSCH or DL received for each CC Bit (grant) for the PDCCH by the total number of ACK indicating the CC (or some ACK number) may consider the ACK- counter (counter) mode). In this case, multi-bit ACK / NACK encoding according to the ACK / NACK payload for each UE, that is, the size of the ACK / NACK payload for full or bundled ACK / NACK transmission set for each UE ACK / NACK transmission scheme based on multi-bit ACK / NACK coding) or ACK / NACK selection can be configurably applied.

ACK / NACK transmission for LTE-A

The LTE-A system supports transmitting a plurality of ACK / NACK information / signals for a plurality of PDSCHs transmitted through a plurality of DL CCs through a specific UL CC. To this end, unlike ACK / NACK transmission using PUCCH format 1a / 1b in the existing Rel-8 LTE, a plurality of ACK / NACK information can be transmitted through PUCCH format 3.

As shown in FIG. 17, a symbol sequence is transmitted in a time-domain spread by an orthogonal cover code (OCC), and multiplexing control signals of several UEs in the same RB using the OCC. In PUCCH format 2, one symbol sequence is transmitted over a time domain and UE multiplexing is performed using a cyclic shift of a CAZAC sequence, whereas in PUCCH format 3, one symbol sequence is transmitted over a frequency domain and OCC based UE multiplexing is performed using time-domain spreading. FIG. 17 illustrates a method of generating and transmitting five SC-FDMA symbols by using one symbol sequence using an OCC of lengh-5 (spreading factor = 5). In the example of FIG. 17, two RS symbols are used for one slot, but various applications may be considered, such as using three RS symbols and using an OCC of spreading factor = 4. Here, the RS symbol may be generated from a CAZAC sequence having a specific cyclic shift, and may be transmitted in a form in which a specific OCC is applied (ie, multiplied) to a plurality of RS symbols in the time domain. In the example of the figure, assuming that 12 modulation symbols are used for each SC-FDMA symbol and each modulation symbol uses QPSK, the maximum number of bits that can be transmitted for each slot is 12x2 = 24 bits. Therefore, the total number of bits that can be transmitted in two slots is 48 bits in total.

For convenience of description, such a channel coding-based multiple ACK / NACK transmission scheme using PUCCH format 2 or E-PUCCH format is called a “multi-bit ACK / NACK coding” transmission method. This method shows a method of transmitting an ACK / NACK coded block generated by channel coding ACK / NACK or DTX information (meaning that a PDCCH cannot be received / detected) for PDSCHs of a plurality of DL CCs. For example, if a UE operates in SU-MIMO mode in a DL CC and receives two codewords (CW), a total of four ACK / ACK, ACK / NACK, NACK / ACK, and NACK / NACK for each CC for each CC A feedback state may be transmitted or may have up to five feedback states including DTX. In addition, if a UE receives a single CW, it may have a maximum of three states of ACK, NACK, and DTX (if it processes NACK in the same way as DTX, it may have a total of two states of ACK, NACK / DTX). Therefore, if the UE aggregates up to 5 DL CCs and operates in the SU-MIMO mode in all CCs, the terminal may have a maximum of 55 transmittable feedback states, and the size of the ACK / NACK payload to represent the total is 12 bits (if For example, if the DTX is processed in the same way as NACK, the number of feedback states is 45, and the total ACK / NACK payload size is 10 bits.

In the above ACK / NACK multiplexing (ie ACK / NACK selection) method applied to the existing Rel-8 TDD system, basically corresponding to the PDCCH scheduling each PDSCH of the UE to secure the PUCCH resources of each UE (ie lowest) We consider an implicit ACK / NACK selection method using an implicit PUCCH resource (linked with a CCE index). Meanwhile, the LTE-A FDD system considers a plurality of ACK / NACK transmissions for a plurality of PDSCHs transmitted through a plurality of DL CCs through one specific UL CC that is basically UE-specific. Each UE linked to an implicit PUCCH resource (ie, linked to the lowest CCE index n_CCE, or linked to n_CCE and n_CCE + 1) or a corresponding implicit PUCCH resource and RRC signaling, linked to a PDCCH scheduling some or all DL CCs. We consider a "ACK / NACK selection" scheme that uses a combination of explicit PUCCH resources reserved in advance.

Meanwhile, even in the LTE-A TDD system, a situation in which a plurality of CCs are aggregated (CA) may be considered. Accordingly, a plurality of ACK / NACK information / signals for a plurality of DLSCHs and a plurality of PDSCHs transmitted through the plurality of CCs may be considered. In this case, it is considered to transmit a specific CC (ie A / N CC) in a UL subframe corresponding to the plurality of DL subframes. Here, unlike in the LTE-A FDD, a method of transmitting a plurality of ACK / NACK corresponding to the maximum number of CWs that can be transmitted through all CCs allocated to the UE for all of the plurality of DL subframes (ie SF) (ie full ACK) / NACK) or by applying ACK / NACK bundling to the CW and / or CC and / or SF domain to reduce the total number of transmission ACK / NACK (ie bundled ACK / NACK) can be considered ( Here, in case of CW bundling, it means applying ACK / NACK bundling for CW for each DL SF for each DL SF, and in case of CC bundling, applying ACK / NACK bundling for all or some CC for each DL SF. In the case of SF bundling, ACK / NACK bundling for all or some DL SFs is applied to each CC In particular, as SF bundling method, for all PDSCH or DL grant PDCCHs received for each CC Total number of ACKs per CC (or Consider an "ACK-counter" method that informs some number of ACKs). At this time, ACK / NACK payload for each UE, that is, ACK based on “multi-bit ACK / NACK coding” or “ACK / NACK selection” according to the size of ACK / NACK payload for full or bundled ACK / NACK transmission set for each UE / NACK transmission scheme can be applied configurable.

Next-generation wireless communication systems use a wide frequency band and aim to support a variety of services or requirements. As an example, look at the 3GPP's New Radio (NR) requirement, which is one of the representative scenarios of Ultra Reliable and Low Latency Communications (URLLC), which provides 0.5 ms of user plane latency and X bytes of data within 10 ms. ^ -5 A low latency, high reliability requirement may need to be transmitted within an error rate.

In addition, unlike the eMBB (enhanced Mobile BroadBand), which has a large traffic capacity, the traffic of URLLC is characterized in that the file size is within tens to hundreds of bytes and occurs sporadically.

Therefore, while eMBB requires transmission that maximizes transmission rate and minimizes overhead of control information, URLLC requires a short scheduling time unit and a reliable transmission method.

A reference time unit assumed and / or used for transmitting and receiving a physical channel may be variously set according to an application or a type of traffic. The reference time may be a basic unit for scheduling a specific physical channel. The reference time unit may vary according to the number of symbols and / or subcarrier spacing that constitutes the scheduling unit.

For convenience of description, the description will be made based on slots and mini-slots as reference time units. The slot may be, for example, a scheduling basic unit used for general data traffic (eg, eMBB).

The mini-slot may have a smaller time interval than the slot in the time domain. It may also be the basic unit of scheduling used in more specific traffic or communication schemes (eg URLLC, unlicensed band or millimeter wave).

However, this is only an example, and even when the eMBB transmits and receives a physical channel based on a mini-slot and / or when the URLLC or another communication technique transmits and receives a physical channel based on a slot, the method proposed in the present disclosure is extended. It is obvious that it can be applied.

In the present specification, when there is a TTI in a different direction during repetition transmission in a specific direction (DL or UL), an operation method (hereinafter, referred to as a first embodiment) and a higher layer signal or SIB in a repetitive transmission operation When the direction indicated by 1 (System Information Block 1) and the direction indicated by the physical layer signal (for example, PDCCH) are different, the operation method (hereinafter, the second embodiment) of the terminal is proposed.

Hereinafter, the embodiments described in this specification are only divided for convenience of description, and some methods and / or some configurations of one embodiment may be substituted with the methods and / or configurations of another embodiment, or may be combined and applied to each other. Of course.

In addition, the slots, subframes, frames, and the like mentioned in the embodiments described herein may correspond to specific examples of time units used in the wireless communication system. Can be. That is, in applying the methods proposed herein, the time unit may be replaced with other time units applied in another wireless communication system.

Time for a service such as URLLC or for traffic requiring strict Block Error rate (BLER), latency, and / or reliability requirements Time domain repetition may be considered. That is, a transmission time interval (TTI), slot, and / or symbol for the purpose of high reliability and / or short latency of a particular transport block (TB) and / or code block (CB) group. Repetition of units may be applied to the channel. The repetition may be semi-persistent scheduling (SPS) or PDCCH-less channel transmission similar to SPS, may be similar to TTI bundling, and UL to a resource previously configured through a higher layer signal considered in NR. (uplink) may be in the form of grant-free UL channel repetitive transmission for transmitting the channel.

First embodiment

First, a description will be given of an operation method when TTIs of different directions exist during repetition transmission in a specific direction (DL or UL).

The methods described below are only divided for convenience of description, and the configuration of one method may be substituted with the configuration of another method or may be applied in combination with each other.

(Method 1)

In the case of TDD, the number of consecutive downlink (DL) or uplink (UL) TTIs may be less than the set and / or indicated repetition times. In this case, waiting for the next transmission opportunity in the same direction may increase latency, which may not be desirable when demanding strict latency requirements. In the case of repetition by dynamic scheduling, the base station (eg, eNB) may initially adjust the number of repetitions, but in the case of semi-static based repetition, it may be difficult to freely adjust the number of repetitions.

Thus, during repetition for transmission in a particular direction (DL or UL), rules may be defined, promised and / or set to stop the repetition if there are TTIs in different directions. And / or, in this case, only fewer transmissions may be possible than necessary to meet a particular reliability requirement, so that if the number of consecutive DLs or UL TTIs is less than the set and / or indicated repetitions, Rules may be defined, promised, and / or set such that open-loop power control parameters (eg, P_O, alpha) are applied to repetitive transmissions. And / or, an increase / decrease value for a separate TPC accumulation for a case where the number of consecutive DL or UL TTIs is less than the set and / or indicated number of repetitions may be defined and / or set.

And / or, if there are TTI (s) in different directions during the repetition of transmission in a particular direction (DL or UL), the gap caused by this TTI (s) is caused by DMRS bundling and / or DMRS sharing. Rules may be defined, promised, and / or set up to determine whether to continue or stop repetition by whether or not it is within a coherence time sufficient to apply. For example, if it is determined that performance is degraded when DMRS bundling is caused due to gaps caused by TTIs in different directions, the repetition may be stopped, and the repetition may be continued. In this case, the maximum gap, which is the basis of the determination, may be previously defined in units of TTIs, slots, and / or symbols, or may be set and / or indicated through higher layer signals or physical layer signals.

(Method 2)

During the repetition of transmission in a specific direction (DL or UL), when there are TTI (s) in different directions (e.g., UL, special subframe, short TTI in special subframe, part of special subframe during DL repetitive transmission), and / Or uplink pilot time slot (UpPTS)), rules may be defined, promised, and / or set to continue repetition in the TTI in that direction, except for the TTI (s) in that different direction.

For example, if a transmission direction such as {D, D, D, S, U, D, D} is set and / or indicated during a specific time interval, DL repetition starts at the first TTI and a total of four DLs are transmitted. If necessary, the terminal may define, promise, and / or set rules to perform the first three DL transmissions and the sixth DL transmission except for S and / or U. Here, D may mean DL, U may be UL, and S may mean a special subframe or a short TTI in a special subframe.

And / or during the repetition of transmission in a particular direction (DL or UL), if there are TTI (s) in different directions, the repetition is stopped according to the time duration length corresponding to the TTI (s) in different directions or It may be determined whether to skip the time duration corresponding to the TTI (s) in different directions and again to repeat the transmission. For example, when the time duration is greater than or equal to a certain time, repetition is stopped. When the time duration is less than or equal to a certain time, the repetitive transmission may be continued while skipping time duration corresponding to TTI (s) in different directions.

And / or during the repetition of transmission in a particular direction (DL or UL), if there are TTI (s) in different directions, the repetition may be stopped or depending on the TTI (s) in different directions, depending on the TTI length. It may be determined whether to repeat the corresponding time duration and continue the repeated transmission again. In one example, the repetition stops because the latency may be too long for a TTI length above a certain length (e.g. subframe), and TTI (s) in different directions for a TTI length (e.g. slot) below and / or below a certain length. The time duration corresponding to this may be skipped and repeated transmission may continue.

In the above-described

methods

1 and 2, a special subframe or a short TTI belonging to the DL is according to the length of a downlink pilot time slot (DwPTS) or an upPTS (or depending on the number of symbols in which the actual DL and / or UL in the TTI are transmitted). Or UL may be assumed. And / or a special subframe or a short TTI belonging to it is always assumed to be a transmission in a direction different from the direction of the repeating channel regardless of the length of the DwPTS or UpPTS, and is ignored or terminated when counting the number of repeating TTIs. And / or can be stopped.

For example, when slot-TTI is configured, whether to support PDSCH transmission in a second slot in a subframe is determined according to the length of the DwPTS. Thus, slot-TTI in which PDSCH transmission is not supported (eg, special subframe configuration 1 and 2) is determined. , If 6, or 7 is set, the second slot of the DwPTS) is ignored when counting the number of repetitive TTIs, whereas the slot-TTI supported for PDSCH transmission (eg, when the

special subframe configuration

3, 4, or 8 is set, is the second of the DwPTS) slot) A rule may be defined to receive a PDSCH in repetitive transmission, which is included in counting the number of repetitive TTIs.

Second embodiment

Next, in the repetitive transmission operation, when the direction indicated by the higher layer signal or the system information block (SIB) 1 and the direction indicated by the physical layer signal (for example, PDCCH) are different, the operation method of the terminal will be described.

(Method 1)

For the repetition of transmission of the DL PDSCH (or UL PUSCH), the UE transmits a TTI indicated by DL by a reference UL / DL configuration (eg, eimta-HARQ-ReferenceConfig-r12) configured through a higher layer signal, The rule defines, promises, and assumes that a PDSCH corresponding to repetition exists only (or only for a TTI, symbol, and / or time interval indicated by UL) for a symbol and / or time period (or a PUSCH is transmitted). And / or can be set.

In this case, a TTI in which a direction different from the link direction of repetitive transmission is set by a physical layer signal (e.g., PDCCH scrambling by eIMTA-RNTI) during repetition (e.g., UL is set for PDSCH repetitive transmission). Even if the symbol, and / or time interval is changed in the same link direction (for example, if the UL TTI is changed to DL TTI when PDSCH is being repeated), the UE corresponds to repetition for the corresponding TTI, symbol, and / or time interval. Rules may be defined, promised, and / or set up to assume that no PDSCH exists (or no PUSCH is sent).

In other words, the UE may define, promise, and / or set a rule to skip PDSCH decoding corresponding to repetition (or skip PUSCH transmission) for a corresponding TTI, symbol, and / or time interval. Can be.

(Method 2)

For repetition of transmission of a DL PDSCH (or UL PUSCH), the UE may only use TTI, symbol, and / or time interval indicated by DL by UL / DL configuration by SIB1 (or TTI, indicated by UL). The rules may be defined, promised, and / or set up to assume that there is a PDSCH corresponding to repetition (or only for a time interval) and / or that a PUSCH is transmitted.

In this case, during the repetition, a TTI, a symbol, in which a direction different from the link direction of the repetitive transmission is set by a physical layer signal (for example, PDCCH scrambled by eIMTA-RNTI) (for example, UL is set in the case of PDSCH repetitive transmission), And / or the PDSCH corresponding to the repetition for the corresponding TTI, symbol, and / or time interval exists even if the time interval is changed in the same link direction (eg, if the UL TTI is changed to the DL TTI when PDSCH is being repeated). Rules may be defined, promised, and / or set to assume no (or no PUSCH is sent).

In other words, the UE may define, promise, and / or set a rule to skip PDSCH decoding corresponding to repetition (or skip PUSCH transmission) for a corresponding TTI, symbol, and / or time period.

(Method 3)

For repetition of transmission of a DL PDSCH (or UL PUSCH), a symbol, TTI, and / or time that is UL in a UL / DL configuration set (semi-static) by an upper layer signal or SIB1 is DL When a UE is changed by a physical layer signal (eg, a PDCCH scrambled by an eIMTA-RNTI) with a symbol (TTI, and / or a time that is DL), the UE may use a corresponding symbol, TTI, and / or time. In this case, a rule may be defined, promised, and / or set to assume that a PDSCH corresponding to repetition exists (or a PUSCH is transmitted).

In other words, during repetitive transmission for a link in a specific direction, a TTI in which a direction different from the link direction of the repetitive transmission is set by a higher layer signal or SIB1 (eg, UL is set in the case of PDSCH repetitive transmission), and a symbol; And / or when the corresponding TTI, symbol, and / or time period are changed in a link in the same direction as the repeated transmission by a physical layer signal (eg, PDCCH scrambled by eIMTA-RNTI), the UE Rules may be defined, promised, and / or set to assume that there is a PDSCH corresponding to repetition (or a PUSCH is transmitted) for the corresponding TTI, symbol, and / or time period.

And / or when the terminal misses the physical layer signal or when the reference UL / DL configuration (eg, eimta-HARQ-ReferenceConfig-r12) set through the UL / DL configuration of the SIB1 and the higher layer signal is different, The UE may skip PDSCH decoding for a TTI, a symbol, and / or a time interval in which a direction different from the link direction of repetitive transmission is set (for example, UL is set for PDSCH repetitive transmission) according to the configuration of SIB1 (or Rules may be defined, promised, and / or set up (i.e., may not count as repetition) to skip PUSCH transmissions.

In this case only, the UE may receive PDSCH (or transmit PUSCH) only as long as excluding the TTI, symbol, and / or time interval from the total number of indicated transmissions. It may be to receive a PDSCH (or transmit a PUSCH) less than the total number of transmissions.

In the above methods, DL may be referred to together including a "DwPTS" section (full or only first slot) of a special subframe in addition to "DL". In addition, the UL may include the term "UpPTS" of the special subframe in addition to the "UL".

In addition, the above methods are applied only when the eIMTA operation is configured for a carrier for which repeated transmission and reception in a specific link direction is configured, indicated, and / or scheduled (for example, when EIMTA-MainConfigServCell-r12 is configured). It may be.

(Method 4)

For repetition of transmission of DL PDSCH (or UL PUSCH), the same precoder will be applied to PDSCH transmission in two adjacent special subframes to enable coherent channel estimation. Rules can be defined to make this assumption.

If the UL / DL configuration (semi-statically) set by the higher layer signal or SIB1 is changed by the physical layer signal (eg, PDCCH scrambled by eIMTA-RNTI), the special according to the changed UL / DL configuration setting Whether to apply the same precoder on a subframe basis may be determined and / or set. That is, the UE may assume that the same precoder will be applied to PDSCH transmission in two adjacent special subframes determined according to a physical layer signal (eg, PDCCH scrambled by eIMTA-RNTI).

And / or, if the corresponding physical layer signal is missed, the UE may assume that the same precoder will be applied to PDSCH transmission in two adjacent special subframes based on the special subframe according to the configuration of SIB1. (Some kind of fallback operation) As an example, when UL / DL configuration 2 is configured by SIB1 and UL / DL configuration 5 is indicated by PDCCH, the UE indicates UL indicated by PDCCH as shown in FIG. 18 (a). While precoder may be assumed to be applied to DL TTIs based on the / DL configuration, when the PDCCH is missed, the precoder to be applied to the DL TTIs based on the UL / DL configuration set by SIB1 as shown in FIG. 18 (b). Can be assumed.

And / or, regardless of the PDCCH, the UE may always determine whether the same precoder is applied based on a special subframe according to configuration of SIB1 (eg, as shown in FIG. 18 (b)). That is, the UE may assume that the same precoder will always be applied to PDSCH transmission in two adjacent special subframes determined according to the configuration of SIB1.

As examples of the embodiments proposed herein may be included as one of the implementation methods of the present invention, it is obvious that they may be regarded as a kind of embodiments.

In addition, as mentioned above, the embodiments proposed herein may be implemented independently, but may be implemented in a combination (or merge) form of some embodiments. The information on whether the embodiments are applied (or the information on the rules of the embodiments) is a rule to inform the base station through predefined signaling (eg, physical layer signaling and / or higher layer signaling, etc.) to the terminal. This may be defined and / or set.

Referring to FIG. 19, first, a UE may receive an upper layer signal including first information on setting of a PDSCH repetition related operation from a base station (S1901). The PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.

The first information may be upper layer parameters blindSlotSubslotPDSCH-Repetitions and / or blindSubframePDSCH-Repetitions.

Next, the terminal may receive second information related to uplink-downlink configuration (UL-DL configuration) from the base station (S1902).

For example, the terminal may confirm that the radio frame includes TTIs of {D, D, D, S, U, D, D} through the second information. Here, U denotes a subframe for uplink (UL) transmission, S denotes a special subframe, and D denotes a subframe for downlink (DL) transmission. Can be. In the above example, the TTI has been described as having a subframe length, but is not limited thereto. The TTI may be set and / or defined in various lengths.

The second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).

When the second information is included in the higher layer signal, the second information may be uplink-downlink configuration information.

When the second information is included in the higher layer signal, the second information may be an upper layer parameter subframeAssignment.

Alternatively, when the second information is included in the physical downlink control channel, the second information may be change related information of uplink-downlink configuration.

When the second information is included in the PDCCH, the PDCCH including the second information may be a PDCCH scrambled by CRC by Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) -Radio Network Temporary Identifier (RNTI). And / or, the terminal may receive information (eg, higher layer parameter EIMTA-MainConfigServCell-r12) regarding the configuration of the eIMTA operation before receiving the second information. That is, when the terminal is set to the upper layer parameter EIMTA-MainConfigServCell-r12, the terminal may receive (and / or monitor and decode) the PDCCH scrambled by the eIMTA-RNTI including the second information.

In addition, the UE may receive uplink-downlink configuration information (eg, higher layer parameter subframeAssignment) before receiving the second information included in the PDCCH. In other words, the terminal receiving the uplink-downlink configuration information may then receive the second information and perform PDSCH repetitive reception based on the uplink-downlink configuration changed by the second information.

Next, the terminal may receive downlink control information (DCI) including the PDSCH repetition number related information (eg, a repetition number) from the base station based on the first information (S1903).

The PDSCH repetition number related information may exist when the first information is set.

Next, the terminal may repeatedly receive the PDSCH from the base station based on the second information and the DCI (S1904).

That is, the UE may check the Transmission Time Interval (TTI) for downlink transmission through the second information, and may repeatedly receive the PDSCH by checking the PDSCH repetition number through the DCI.

In the present specification, the TTI may be referred to as a transmission time unit.

Next, when one or more TTIs for uplink transmission are present during repeated reception of the PDSCH, the terminal may determine whether to continuously receive the PDSCH based on a time duration of the one or more TTIs (S1905). ). For example, the UE may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue repeated PDSCH reception after the one or more TTIs.

Here, each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe. For example, the UE may assume a special subframe as a subframe for uplink transmission, and calculate a duration by reporting one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .

And / or, the UE may assume that the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.

Next, when the duration of the one or more TTIs is greater than or equal to a certain time, the UE stops repeatedly receiving the PDSCH, and if the duration of the one or more TTIs is less than a specific time, the terminal continues the PDSCH after the one or more TTIs. Can be received repeatedly. That is, when the duration of the one or more TTIs is less than a specific time, the UE may repeatedly receive the PDSCH in the TTI for the next downlink transmission without expecting the PDSCH repeated reception in one or more TTIs for the uplink transmission. .

The specific time may be a preset time to satisfy the latency requirement.

For example, the UE receives the PDSCH repetition number related information indicating four repetitions, and includes the TTI starting the repetitive reception through the second information (first TTI) so that seven consecutive TTIs are {D, D, D , S, U, D, D}. Next, the UE may repeatedly receive the PDSCH in TTIs for three consecutive downlink transmissions. Next, the terminal may confirm that there is one or more consecutive TTIs (S, U) for uplink transmission, and may verify the duration of the one or more consecutive TTIs (S, U). If the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1ms), the UE may stop the repeated PDSCH reception. Or, if the duration of the corresponding TTIs (S, U) is less than a predetermined specific time (for example, 1ms), the UE may receive the remaining one PDSCH in the TTI (D) for the next downlink transmission. Here, although S is assumed to be a subframe for uplink transmission, it may be assumed as a subframe for downlink transmission by the terminal.

And / or, if the terminal includes one or more consecutive TTIs for uplink transmission in the TTI for repeated reception through the second information and DCI before the PDSCH repeated reception, the terminal checks the duration of the one or more TTIs, and It may be determined whether to repeatedly receive the PDSCH before the one or more TTIs or continue repeating the reception after the one or more TTIs, and may start to repeat the PDSCH.

And / or, if there is one or more TTIs for uplink transmission during PDSCH repeat reception, whether or not to continue repeated reception after one or more TTIs according to the length of the TTI included in the one or more TTIs. Can be determined. For example, if the length of the TTI included in one or more TTIs for uplink transmission is equal to or longer than the length of the subframe, the UE stops repeating the reception of the PDSCH and continues the PDSCH if it is shorter than the length of the subframe. Can be repeatedly received.

Through this, the present invention can improve latency performance in PDSCH repetition operation.

Although the present invention has been described based on downlink repetitive reception (PDSCH repetitive reception) in the above-described example, the present invention is not limited to downlink repetitive reception, and may be implemented through a terminal and / or a base station through uplink repetitive reception.

Hereinafter, since the operation method of the terminal illustrated in FIG. 19 is the same as the operation method of the terminal described with reference to FIGS. 1 to 18, detailed description thereof will be omitted.

In this regard, the above-described operation of the terminal may be specifically implemented by the terminal device 2120 illustrated in FIG. 21 of the present specification. For example, the above-described operation of the terminal may be performed by the processor 2121 and / or the RF unit 2123.

Referring to FIG. 21, first, the processor 2121 may receive an upper layer signal including a first information on setting of a PDSCH repetition related operation through an RF unit 2123 from a base station (S1901). . The PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.

Next, the processor 2121 may receive second information related to uplink-downlink configuration (UL-DL configuration) from the base station through the RF unit 2123 (S1902).

Next, the processor 2121 receives downlink control information (DCI) from the base station through the RF unit 2123 based on the first information, the downlink control information including the PDSCH repetition number related information (eg, a repetition number). Can be received (S1903).

Next, the processor 2121 may repeatedly receive the PDSCH from the base station based on the second information and the DCI through the RF unit 2123 (S1904).

That is, the UE may check the TTI for downlink transmission through the second information, check the PDSCH repetition number through the DCI, and repeatedly receive the PDSCH.

Next, when there is one or more Transmission Time Intervals (TTIs) for uplink transmission during repetitive reception of the PDSCH through the RF unit 2123, the processor 2121 may determine a time duration of the one or more TTIs. It may be determined whether the PDSCH is repeatedly received based on the operation (S1905). For example, the UE may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue repeated PDSCH reception after the one or more TTIs.

When the duration of the one or more TTIs is greater than or equal to a certain time through the RF unit 2123, the processor 2121 stops repeat reception of the PDSCH, and if the duration of the one or more TTIs is less than or equal to a specific time, After the TTIs, the PDSCH may be controlled to be repeatedly received.

That is, when the duration of the one or more TTIs is less than a specific time, the UE may repeatedly receive the PDSCH in the TTI for the next downlink transmission without expecting the PDSCH repeated reception in one or more TTIs for the uplink transmission. .

The specific time may be a preset time to satisfy the latency requirement.

Hereinafter, since the operation of the terminal illustrated in FIG. 20 is the same as that of the terminal described with reference to FIGS. 1 to 18, detailed descriptions thereof will be omitted.

Referring to FIG. 20, first, a base station may transmit a higher layer signal including first information on setting of a PDSCH repetition related operation to a terminal (S2001). The PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.

Next, the base station may transmit second information related to uplink-downlink configuration (UL-DL configuration) to the terminal (S2002).

Next, the base station may transmit downlink control information (DCI) including the PDSCH repetition number related information (eg, a repetition number) to the terminal based on the first information (S2003).

Next, the base station may repeatedly transmit the PDSCH to the terminal (S2004).

Next, when one or more transmission time intervals (TTIs) for uplink transmission are present during repeated reception of the PDSCH, the base station determines whether to repeatedly transmit the PDSCH based on a time duration of the one or more TTIs. Can be determined (S2005). For example, the base station may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue PDSCH repeated transmission after the one or more TTIs.

Here, each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe. For example, the base station may assume a special subframe as a subframe for uplink transmission, and calculate a duration by looking at one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .

And / or, the base station may assume the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.

The base station stops repetitive transmission of the PDSCH when the duration of the one or more TTIs is more than a certain time, and continuously repeats transmission of the PDSCH after the one or more TTIs when the duration of the one or more TTIs is less than a specific time. Can be.

The specific time may be a preset time to satisfy the latency requirement.

For example, the base station may repeatedly transmit the PDSCH four times. The base station may include the TTI starting the repetitive transmission (first TTI) to confirm that seven consecutive TTIs are {D, D, D, S, U, D, D}. Next, the base station may repeatedly transmit the PDSCH in TTIs for three consecutive downlink transmissions. Next, the base station can confirm that there are one or more consecutive TTIs (S, U) for uplink transmission and can confirm the duration of the one or more consecutive TTIs (S, U). The base station may stop the PDSCH repetitive transmission when the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1 ms). Or, if the duration of the corresponding TTIs (S, U) is less than a predetermined specific time (eg, 1 ms), the base station may transmit the remaining one PDSCH in the TTI (D) for the next downlink transmission. Here, S is assumed to be a subframe for uplink transmission, but may also be assumed to be a subframe for downlink transmission by the base station.

And / or, if the base station includes one or more consecutive TTIs for uplink transmission in the TTI for PDSCH repeating transmission before the PDSCH repeating transmission, the base station verifies the duration of the one or more TTIs, and checks the PDSCH before the one or more TTIs. It may be determined whether to repeatedly transmit or continue repeated transmission after one or more TTIs, and may start PDSCH repeated transmission.

And / or, if there is one or more TTIs for uplink transmission during PDSCH repetitive transmission, whether to continue repeated transmission after one or more TTIs according to the length of the TTI included in the one or more TTIs. Can be determined. For example, the base station stops PDSCH repetitive transmission if the length of the TTI included in one or more TTIs for uplink transmission is equal to or longer than the length of the subframe, and continues the PDSCH if it is shorter than the length of the subframe. Can be repeated.

Although the present invention has been described based on downlink repetitive transmission (PDSCH repetitive transmission) in the above-described example, uplink repetitive transmission and reception may be implemented by the terminal and / or the base station.

Hereinafter, since the operation method of the base station illustrated in FIG. 20 is the same as the operation method of the base station described with reference to FIGS. 1 to 18, detailed description thereof will be omitted.

In this regard, the above-described operation of the base station may be specifically implemented by the base station apparatus 2110 shown in FIG. 21 of the present specification. For example, the above-described operation of the base station may be performed by the processor 2111 and / or the RF unit 2113.

Referring to FIG. 20, first, the processor 2111 may transmit a higher layer signal including first information about a setting of a PDSCH repetition related operation to the terminal through the RF unit 2113 (S2001). The PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.

Next, the processor 2111 may transmit second information related to uplink-downlink configuration (UL-DL configuration) to the terminal through the RF unit 2113 (S2002).

Next, the processor 2111 transmits downlink control information (DCI) including downlink control information (eg, repetition number) to the terminal through the RF unit 2113 based on the first information. Can be transmitted (S2003).

Next, the processor 2111 may repeatedly transmit the PDSCH to the terminal through the RF unit 2113 (S2004).

The processor 2111 stops repetitive transmission of the PDSCH when the duration of the one or more TTIs is greater than or equal to a specific time through the RF unit 2113, and when the duration of the one or more TTIs is less than a specific time, After the TTIs, the PDSCH may be continuously transmitted repeatedly.

The specific time may be a preset time to satisfy the latency requirement.

Hereinafter, since the operation of the base station illustrated in FIG. 20 is the same as that of the base station described with reference to FIGS. 1 to 18, detailed descriptions thereof will be omitted.

General apparatus to which the present invention can be applied

21 shows an example of an internal block diagram of a wireless communication device to which the present invention can be applied.

Referring to FIG. 21, a wireless communication system includes a base station 2110 and a plurality of terminals 2120 located in an area of a base station 2110.

The base station 2110 includes a processor 2111, a memory 2112, and an RF unit 2113. The processor 2111 implements the functions, processes, and / or methods proposed in FIGS. 1 to 20. Layers of the air interface protocol may be implemented by the processor 2111. The memory 2112 is connected to the processor 2111 and stores various information for driving the processor 2111. The RF unit 2113 is connected to the processor 2111 to transmit and / or receive a radio signal.

The terminal 2120 includes a processor 2121, a memory 2122, and an RF unit 2123. The processor 2121 implements the functions, processes, and / or methods proposed in FIGS. 1 to 20. Layers of the air interface protocol may be implemented by the processor 2121. The memory 2122 is connected to the processor 2121 and stores various information for driving the processor 2121. The RF unit 2123 is connected to the processor 2121 and transmits and / or receives a radio signal.

The

memories

2112 and 2122 may be inside or outside the

processors

2111 and 2121, and may be connected to the

processors

2111 and 2121 by various well-known means.

The

memories

2112 and 2122 may store a program for processing and controlling the

processors

2111 and 2121, and may temporarily store input / output information.

The

memories

2112 and 2122 may be utilized as buffers.

In addition, the base station 2110 and / or the terminal 2120 may have a single antenna or multiple antennas.

In particular, FIG. 22 is a diagram illustrating the terminal of FIG. 21 in more detail.

Referring to FIG. 22, a terminal may include a processor (or a digital signal processor (DSP) 2210, an RF module (or RF unit) 2235, and a power management module 2205). ), Antenna 2240, battery 2255, display 2215, keypad 2220, memory 2230, SIM card Subscriber Identification Module card) 2225 (this configuration is optional), a speaker 2245 and a microphone 2250. The terminal may also include a single antenna or multiple antennas. Can be.

The processor 2210 implements the functions, processes, and / or methods proposed in FIGS. 1 to 21. The layer of the air interface protocol may be implemented by the processor 2210.

The memory 2230 is connected to the processor 2210 and stores information related to the operation of the processor 2210. The memory 2230 may be inside or outside the processor 2210 and may be connected to the processor 2210 by various well-known means.

The user enters command information, such as a telephone number, for example by pressing (or touching) a button on keypad 2220 or by voice activation using microphone 2250. The processor 2210 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 2225 or the memory 2230. In addition, the processor 2210 may display command information or driving information on the display 2215 for the user's knowledge and convenience.

The RF module 2235 is connected to the processor 2210 to transmit and / or receive an RF signal. The processor 2210 passes command information to the RF module 2235 to transmit, for example, a radio signal constituting voice communication data to initiate communication. The RF module 2235 is composed of a receiver and a transmitter for receiving and transmitting a radio signal. The antenna 2240 functions to transmit and receive a radio signal. Upon receiving the wireless signal, the RF module 2235 may forward the signal and convert the signal to baseband for processing by the processor 2210. The processed signal may be converted into audible or readable information output through the speaker 2245.

In detail, FIG. 23 illustrates an example of an RF module that may be implemented in a frequency division duplex (FDD) system.

First, in the transmission path, the processor described in FIGS. 21 and 22 processes the data to be transmitted and provides an analog output signal to the transmitter 2310.

Within transmitter 2310, the analog output signal is filtered by a low pass filter (LPF) 2311 to remove images caused by digital-to-analog conversion (ADC), and an upconverter ( Up-converted from baseband to RF by Mixer, 2312, and amplified by Variable Gain Amplifier (VGA) 2313, the amplified signal is filtered by filter 2314 and powered amplifier Further amplified by Amplifier (PA) 2315, routed through duplexer (s) 2350 / antenna switch (s) 2360, and transmitted via antenna 2370.

Also, in the receive path, the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 2360 / duplexers 2350 and provided to the receiver 2320. .

Within the receiver 2320, the received signals are amplified by a Low Noise Amplifier (LNA) 2323, filtered by a bandpass filter 2324, and received from RF by a down converter (Mixer, 2325). Downconvert to baseband.

The down-converted signal is filtered by low pass filter (LPF) 2326 and amplified by VGA 2327 to obtain an analog input signal, which is provided to the processor described in FIGS. 21 and 22.

In addition, a local oscillator (LO) generator 2340 provides transmit and receive LO signals to the generate and up converter 2312 and down converter 2325, respectively.

Phase Locked Loop (PLL) 2330 also receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides control signals to LO generator 2340.

Also, the circuits shown in FIG. 23 may be arranged differently from the configuration shown in FIG. 23.

Specifically, FIG. 24 illustrates an example of an RF module that may be implemented in a time division duplex (TDD) system.

The transmitter 2410 and receiver 2420 of the RF module in the TDD system are identical to the structure of the transmitter and receiver of the RF module in the FDD system.

Hereinafter, the RF module of the TDD system will be described only for the structure that differs from the RF module of the FDD system, and the description of the same structure will be described with reference to FIG. 23.

The signal amplified by the transmitter's power amplifier (PA) 2415 is routed through a band select switch (2450), a band pass filter (BPF) 2460, and antenna switch (s) 2470. And is transmitted through the antenna 2480.

In addition, in the receive path, the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 2470, the band pass filter 2460 and the band select switch 2450. To the receiver 2420.

25 illustrates an example of a signal processing module structure in a transmission device.

Hereinafter, the terminal or the base station of FIG. 21 may be referred to as a transmitting device or a receiving device.

Here, signal processing may be performed in a processor of a base station / terminal such as the

processors

2111 and 2121 of FIG. 21.

Referring to FIG. 25, a transmission device in a terminal 2120 or a base station 2121 may include a scrambler 2501, a modulator 2502, a layer mapper 2503, an antenna port mapper 2504, a resource block mapper 2505, and a signal. Generator 2506 may be included.

The transmitting device may transmit one or more codewords. Coded bits in each codeword are scrambled by the scrambler 2501 and transmitted on the physical channel. The codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.

The scrambled bits are modulated into complex-valued modulation symbols by modulator 2502. The modulator 2502 modulates the scrambled bits according to a modulation scheme and arranges the scrambled bits as complex modulation symbols representing positions on a signal constellation. There is no restriction on a modulation scheme, and m-Phase Shift Keying (m-PSK) or m-Quadrature Amplitude Modulation (m-QAM) may be used to modulate the encoded data. The modulator may be referred to as a modulation mapper.

The complex modulation symbol may be mapped to one or more transport layers by layer mapper 2503. Complex modulation symbols on each layer may be mapped by antenna port mapper 2504 for transmission on the antenna port.

The resource block mapper 2505 may map the complex modulation symbol for each antenna port to an appropriate resource element in a virtual resource block allocated for transmission. The resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme. The resource block mapper 2505 may allocate a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex it according to a user.

The signal generator 2506 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation scheme, for example, an Orthogonal Frequency Division Multiplexing (OFDM) scheme, thereby complex-valued time domain. An OFDM symbol signal can be generated. The signal generator may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

26 illustrates another example of a signal processing module structure in a base station or a terminal. Here, the signal processing may be performed in a processor of the terminal / base station such as the

processors

2111 and 2120 of FIG. 21.

Referring to FIG. 26, a signal processing module for signal transmission includes a scrambler 2601, a modulator 2602, a layer mapper 2603, a precoder 2604, a resource block mapper 2605, and a signal generator 2606. can do.

The transmitting device may scramble the coded bits in the codeword by the scrambler 2601 for one codeword and then transmit the same through a physical channel.

The scrambled bit is modulated into a complex modulation symbol by modulator 2602. The modulator may be arranged as a complex modulation symbol representing a position on a signal constellation by modulating the scrambled bit according to a predetermined modulation scheme. The modulation scheme is not limited, and pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), or m-Quadrature Amplitude Modulation (m-QAM) It can be used for modulation of the encoded data.

The complex modulation symbol may be mapped to one or more transport layers by the layer mapper 2603.

Complex modulation symbols on each layer may be precoded by the precoder 2604 for transmission on the antenna port. Here, the precoder may perform precoding after performing transform precoding on the complex modulation symbol. Alternatively, the precoder may perform precoding without performing transform precoding. The precoder 2604 may process the complex modulation symbol in a MIMO scheme according to a multiple transmit antenna to output antenna specific symbols and distribute the antenna specific symbols to the corresponding resource block mapper 2605. The output z of the precoder 2604 can be obtained by multiplying the output y of the layer mapper 2603 by the precoding matrix W of NХM. Where N is the number of antenna ports and M is the number of layers.

The resource block mapper 2605 maps the demodulation modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.

The resource block mapper 2605 may assign a complex modulation symbol to an appropriate subcarrier and multiplex it according to a user.

The signal generator 2606 may generate a complex-valued time domain (OFDM) orthogonal frequency division multiplexing (OFDM) symbol signal by modulating the complex modulation symbol in a specific modulation scheme, for example, the OFDM scheme. The signal generator 2606 may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator 2606 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

The signal processing of the receiver may be configured as the inverse of the signal processing of the transmitter. In detail, the

processor

2110 or 2120 of the receiving apparatus performs decoding and demodulation on the radio signal received through the antenna port (s) of the

RF units

2113 and 2123 from the outside. The receiving device may include a plurality of multiple receiving antennas, and each of the signals received through the receiving antenna is restored to the baseband signal and then restored to the data sequence originally intended to be transmitted by the transmission device through multiplexing and MIMO demodulation. . The receiver may include a signal recoverer for recovering the received signal into a baseband signal, a multiplexer for combining and multiplexing the received processed signals, and a channel demodulator for demodulating the multiplexed signal sequence with a corresponding codeword. The signal reconstructor, multiplexer, and channel demodulator may be configured as one integrated module or each independent module for performing their functions. More specifically, the signal reconstructor is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, a CP remover for removing a CP from the digital signal, and a fast fourier transform (FFT) to the signal from which the CP is removed. FFT module for outputting a frequency domain symbol by applying a, and may include a resource element demapper (equalizer) to restore the frequency domain symbol to an antenna-specific symbol (equalizer). The antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by a transmitting device by a channel demodulator.

In the present specification, the wireless device includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, Robots, Augmented Reality (AR) devices, Virtual Reality (VR) devices, MTC devices, IoT devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, or other areas of the fourth industrial revolution, or It may be a device related to the 5G service. For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the MTC device and the IoT device are devices that do not require human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart bulbs, door locks, various sensors, and the like. For example, a medical device is a device used to examine, replace, or modify a device, structure, or function used for diagnosing, treating, alleviating, treating, or preventing a disease, such as a medical device, a surgical device, ( In vitro) diagnostic devices, hearing aids, surgical devices, and the like. For example, the security device is a device installed to prevent a risk that may occur and maintain safety, and may be a camera, a CCTV, a black box, or the like. For example, the fintech device is a device that can provide financial services such as mobile payment, and may be a payment device or a point of sales (POS). For example, the climate / environmental device may mean a device for monitoring and predicting the climate / environment.

In the present specification, the terminal is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet PC. (tablet PC), ultrabook, wearable device (e.g. smartwatch, glass glass, head mounted display), foldable device And the like. For example, the HMD is a display device of a type worn on the head and may be used to implement VR or AR.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to combine the some components and / or features to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the embodiments can be combined to form a new claim by combining claims which are not expressly cited in the claims or by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The method for transmitting and receiving downlink data in the wireless communication system of the present specification has been described with reference to an example applied to the 3GPP LTE / LTE-A system, but is applied to various wireless communication systems such as 5G system in addition to the 3GPP LTE / LTE-A system. It is possible to do

Claims

In the method for receiving a physical downlink shared channel (PDSCH) in a wireless communication system, the method performed by the terminal,

Receiving an upper layer signal from a base station, the upper layer signal including first information about a setting of a PDSCH repetition related operation;

Receiving second information related to uplink-downlink configuration (UL-DL configuration) from the base station;

Receiving downlink control information (DCI) from the base station including downlink control information (PDI) related information based on the first information;

Repeatedly receiving the PDSCH from the base station based on the second information and the DCI; And

If there is one or more transmission time units for uplink transmission during repeated reception of the PDSCH, determining whether to continue receiving the PDSCH repeatedly based on the duration of the one or more transmission time units.
The method of claim 1,

If the duration of the one or more transmission time units is greater than or equal to a specific time, the repeated reception of the PDSCH is stopped, and if the duration of the one or more transmission time units is less than a specific time, the PDSCH is added after the one or more transmission time units. Continually receiving repeatedly.
The method of claim 1, wherein each of the one or more transmission time units is a subslot, slot, subframe, special subframe, or UpPTS.
The method of claim 1,

The second information is included in the higher layer signal or a physical downlink control channel (PDCCH).
A terminal for receiving a physical downlink shared channel (PDSCH) in a wireless communication system,

A transceiver for transmitting and receiving a wireless signal,

A processor that is functionally connected to the transceiver;

The processor is configured to receive an upper layer signal from the base station, the upper layer signal including first information on the configuration of PDSCH repetition related operation, and to receive the second information related to uplink-downlink configuration (UL-DL configuration). Received from the base station and receiving downlink control information (DCI) including information related to the number of PDSCH repetitions based on the first information from the base station, and receiving from the base station based on the second information and the DCI. If the PDSCH is repeatedly received and one or more transmission time units for uplink transmission exist during repeated reception of the PDSCH, it is determined whether to continuously receive the PDSCH based on the duration of the one or more transmission time units. Terminal to control to.
The method of claim 5,

The processor stops repetitive reception of the PDSCH when the duration of the one or more transmission time units is greater than or equal to a specific time, and when the duration of the one or more transmission time units is less than a specific time, the one or more transmission time units. After that, the terminal continuously controls to repeatedly receive the PDSCH.
6. The terminal of claim 5, wherein each of the one or more transmission time units is a subslot, slot, subframe, special subframe, or UpPTS.
The method of claim 5,

The second information is included in the higher layer signal or a physical downlink control channel (PDCCH).
In the base station for transmitting a physical downlink shared channel (PDSCH) in a wireless communication system,

A transceiver for transmitting and receiving a wireless signal,

A processor that is functionally connected to the transceiver;

The processor transmits an upper layer signal including first information on setting of a PDSCH repetition related operation to the terminal and transmits second information related to uplink-downlink configuration to the terminal. Transmits downlink control information (DCI) including downlink control information (DCI) to the terminal, repeatedly transmits the PDSCH to the terminal, and transmits an uplink during the repeated transmission of the PDSCH. And if there are one or more transmission time units for, determining to continue transmitting the PDSCH repeatedly based on the duration of the one or more transmission time units.
The method of claim 9,

The processor stops repetitive transmission of the PDSCH when the duration of the one or more transmission time units is longer than a specific time, and when the duration of the one or more transmission time units is less than a specific time, the one or more transmission time units And a base station controlling to continuously transmit the PDSCH repeatedly.
10. The base station of claim 9, wherein each of the one or more transmission time units is a subslot, slot, subframe, special subframe, or UpPTS.
The method of claim 9,

The second information is included in the upper layer signal or a physical downlink control channel (PDCCH).